Chelsea keeper in until April.
The U's have further bolstered their ranks as they look to pull away from trouble at the foot of the table, adding goalkeeper Sam Walker on loan from Premier League side Chelsea.
The imposing shot stopper has enjoyed successful loan spells with Yeovil, Bristol Rovers and Northampton Town.
In that time, the 21-year-old has made over 60 league appearances and will be with the U's until the end of the season, having penned his loan deal on Monday morning.
He becomes the third Chelsea player to have signed on loan this season, with Archange Nkumu and Billy Clifford also having pulled on the blue and white stripes in 2012/13.
The imposing shot stopper has enjoyed successful loan spells with Yeovil, Bristol Rovers and Northampton Town.
In that time, the 21-year-old has made over 60 league appearances and will be with the U's until the end of the season, having penned his loan deal on Monday morning.
He becomes the third Chelsea player to have signed on loan this season, with Archange Nkumu and Billy Clifford also having pulled on the blue and white stripes in 2012/13.